// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "cc/playback/largest_display_item.h"

#include <stddef.h>

#include <algorithm>

#include "cc/playback/clip_display_item.h"
#include "cc/playback/clip_path_display_item.h"
#include "cc/playback/compositing_display_item.h"
#include "cc/playback/drawing_display_item.h"
#include "cc/playback/filter_display_item.h"
#include "cc/playback/float_clip_display_item.h"
#include "cc/playback/transform_display_item.h"

#include "third_party/skia/include/core/SkPicture.h"

namespace {
// Either FilterDisplayItem or TransformDisplayItem is largest. It depends on
// the platform.
const size_t kLargestDisplayItemSize = sizeof(cc::FilterDisplayItem) > sizeof(cc::TransformDisplayItem)
    ? sizeof(cc::FilterDisplayItem)
    : sizeof(cc::TransformDisplayItem);
} // namespace

namespace cc {

size_t LargestDisplayItemSize()
{
    // Use compile assert to make sure largest is actually larger than all other
    // type of display_items.
    static_assert(sizeof(ClipDisplayItem) <= kLargestDisplayItemSize,
        "Largest Draw Quad size needs update. ClipDisplayItem"
        " is currently largest.");
    static_assert(sizeof(EndClipDisplayItem) <= kLargestDisplayItemSize,
        "Largest Draw Quad size needs update. EndClipDisplayItem"
        " is currently largest.");
    static_assert(sizeof(ClipPathDisplayItem) <= kLargestDisplayItemSize,
        "Largest Draw Quad size needs update. ClipPathDisplayItem"
        " is currently largest.");
    static_assert(sizeof(EndClipPathDisplayItem) <= kLargestDisplayItemSize,
        "Largest Draw Quad size needs update. EndClipPathDisplayItem"
        " is currently largest.");
    static_assert(sizeof(CompositingDisplayItem) <= kLargestDisplayItemSize,
        "Largest Draw Quad size needs update. CompositingDisplayItem"
        " is currently largest.");
    static_assert(sizeof(EndCompositingDisplayItem) <= kLargestDisplayItemSize,
        "Largest Draw Quad size needs update. EndCompositingDisplayItem"
        " is currently largest.");
    static_assert(sizeof(DrawingDisplayItem) <= kLargestDisplayItemSize,
        "Largest Draw Quad size needs update. DrawingDisplayItem"
        " is currently largest.");
    static_assert(sizeof(FilterDisplayItem) <= kLargestDisplayItemSize,
        "Largest Draw Quad size needs update. FilterDisplayItem"
        " is currently largest.");
    static_assert(sizeof(EndFilterDisplayItem) <= kLargestDisplayItemSize,
        "Largest Draw Quad size needs update. EndFilterDisplayItem"
        " is currently largest.");
    static_assert(sizeof(FloatClipDisplayItem) <= kLargestDisplayItemSize,
        "Largest Draw Quad size needs update. FloatClipDisplayItem"
        " is currently largest.");
    static_assert(sizeof(EndFloatClipDisplayItem) <= kLargestDisplayItemSize,
        "Largest Draw Quad size needs update. EndFloatClipDisplayItem"
        " is currently largest.");
    static_assert(sizeof(TransformDisplayItem) <= kLargestDisplayItemSize,
        "Largest Draw Quad size needs update. TransformDisplayItem"
        " is currently largest.");
    static_assert(sizeof(EndTransformDisplayItem) <= kLargestDisplayItemSize,
        "Largest Draw Quad size needs update. EndTransformDisplayItem"
        " is currently largest.");

    return kLargestDisplayItemSize;
}

} // namespace cc
